Move to pyproject.toml

[dlopes7]

We need to move from setup.py to pyproject.toml as that will soon be deprecated and eventually unsupported: pypa/pip#6334

We should:

1. Change the template to use pyproject.toml instead of setup.py
2. Figure out how to do versions, because today we are reading from extension.yaml
3. Move the ruff configuration to pyproject.toml instead of ruff.toml
4. Update the documentation
5. Update our internal build systems to work with pyproject.toml